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홀소자와 자기코어를 이용한 하이브리드 및 전기자동차용 전류센서 제작
연교흠(Kyoheum Yeon),김시동(Sidong Kim),손대락(Derac Son) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.2
A current sensor is one of important component which is used for the electrical current measurement during charge and discharge of the battery, and monitoring system of the motor controller in the electric and hybrid vehicle. In this study, we have developed an open loop type current sensor using GaAs Hall sensor and magnetic core has an air gap. The Hall sensor detect magnetic field produced by the current to be measured. The 3 mm air gap core was made by HGO electrical steel sheets after slitting, winding, annealing, molding, and cutting. Developed current sensor shows 0.03 % linearity within DC current range from ?400 A to +400 A. Operating temperature range was extended to the range of ?40~105 oC using temperature compensating electronic circuit. To Improve frequency bandwidth limit due to the air flux of PCB (Printed Circuit Board) and Hall sensor, We employed an air flux compensating loop near Hall sensor or on PCB. Frequency bandwidth of the sensor was 100 kHz when we applied sine wave current of 40 A·turn in the frequency range from 100 Hz to 100 kHz. For the dynamic response time measurement, 5 kHz square wave current of 40 A·turn was applied to the sensor. Response time was calculated time reach to 90 % of saturation value and smaller than 2 μs.
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